Pre-hung door with metal studs
Since this is a metal stud wall, we're talking non-loadbearing, right? So that door can go wherever you want it to go.
One problem you may encounter is electric wiring (or maybe even plumbing, though not likely) running across where you intend to locate the door. You'll have to re-route this, or put the door somewhere else.
It may be possible to determine if any electric is in the way by taking off some of the closest receptacles for a look. Unfortunately the wiring will most likely run out of the top of the box, and you still won't know which way it goes.
But, in the event you are wire free, you do it just about like you said. You can't do much about anchoring into the top plate, but you CAN do some nailing or screwing to the bottom plate. Plenty of screws in both sides of the wall will firm up the 2 x 4's for mounting the door. Don't forget to put in a header piece so you'll have someplace to nail the trim. Doubling up the side 2 x 4's will help make a studerier installation.
"True eloquence consists in saying all that is necessary, and only that which is."
François Duc de La Rochefoucauld
Last edited by Willie T; 02-06-2009 at 09:27 PM.